package com.aaa.gateway.filter;

import com.aaa.gateway.white.UrlPath;
import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @program: aaa-his-parent
 * @description:
 * @author: 闫克起2
 * @create: 2023-12-08 09:06
 **/
@Component
public class LoginFilter implements GlobalFilter, Ordered {

    @Autowired
    private UrlPath urlPath;

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取请求对象和响应对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //2.获取请求路径
        String path = request.getPath().toString();
        System.out.println(urlPath.getPath()+"~~~~~~~~~~~~~~~~");
        //3.判断请求路径是否再白名单中
        if (urlPath.getPath().contains(path)) {
            return chain.filter(exchange);
        }

        //4. 获取请求token
        String token = request.getHeaders().getFirst("token");
        //5. 判断token是否有效。
        Boolean flag = redisTemplate.hasKey("user:" + token);
        if (flag) {
            ValueOperations<String, String> forValue = redisTemplate.opsForValue();
            //token的令牌刷新机制
            forValue.set("user:" + token, forValue.get("user:" + token), 30, TimeUnit.MINUTES);
            return chain.filter(exchange);
        }

        //6. 返回一个json数据
        Map<String, Object> map = new HashMap<>();
        map.put("msg", "未登录");
        map.put("code", 403);
        //3.3作JSON转换
        byte[] bytes = JSON.toJSONString(map).getBytes(StandardCharsets.UTF_8);
        //3.4调用bufferFactory方法,生成DataBuffer对象
        DataBuffer buffer = response.bufferFactory().wrap(bytes);
        //4.调用Mono中的just方法,返回要写给前端的JSON数据
        return response.writeWith(Mono.just(buffer));
    }

    @Override
    public int getOrder() {
        return 0;
    }
}















